sys/netinet6/in6_proto.c

   1 /*      $FreeBSD: src/sys/netinet6/in6_proto.c,v 1.6.2.9 2003/01/24 05:11:35 sam Exp $  */
   2 /*      $KAME: in6_proto.c,v 1.91 2001/05/27 13:28:35 itojun Exp $      */
   3
   4 /*
   5  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the project nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 /*
  34  * Copyright (c) 1982, 1986, 1993
  35  *      The Regents of the University of California.  All rights reserved.
  36  *
  37  * Redistribution and use in source and binary forms, with or without
  38  * modification, are permitted provided that the following conditions
  39  * are met:
  40  * 1. Redistributions of source code must retain the above copyright
  41  *    notice, this list of conditions and the following disclaimer.
  42  * 2. Redistributions in binary form must reproduce the above copyright
  43  *    notice, this list of conditions and the following disclaimer in the
  44  *    documentation and/or other materials provided with the distribution.
  45  * 3. Neither the name of the University nor the names of its contributors
  46  *    may be used to endorse or promote products derived from this software
  47  *    without specific prior written permission.
  48  *
  49  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  50  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  51  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  52  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  53  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  54  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  55  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  56  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  57  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  58  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  59  * SUCH DAMAGE.
  60  *
  61  *      @(#)in_proto.c  8.1 (Berkeley) 6/10/93
  62  */
  63
  64 #include "opt_inet.h"
  65 #include "opt_inet6.h"
  66 #include "opt_carp.h"
  67
  68 #include <sys/param.h>
  69 #include <sys/socket.h>
  70 #include <sys/socketvar.h>
  71 #include <sys/protosw.h>
  72 #include <sys/kernel.h>
  73 #include <sys/domain.h>
  74 #include <sys/mbuf.h>
  75 #include <sys/systm.h>
  76 #include <sys/sysctl.h>
  77
  78 #include <net/if.h>
  79 #include <net/radix.h>
  80 #include <net/route.h>
  81
  82 #include <netinet/in.h>
  83 #include <netinet/in_systm.h>
  84 #include <netinet/in_var.h>
  85 #include <netinet/ip_encap.h>
  86 #include <netinet/ip.h>
  87 #include <netinet/ip_var.h>
  88 #include <netinet/ip6.h>
  89 #include <netinet6/ip6_var.h>
  90 #include <netinet/icmp6.h>
  91
  92 #include <netinet/tcp.h>
  93 #include <netinet/tcp_timer.h>
  94 #include <netinet/tcp_var.h>
  95 #include <netinet/udp.h>
  96 #include <netinet/udp_var.h>
  97 #include <netinet6/tcp6_var.h>
  98 #include <netinet6/raw_ip6.h>
  99 #include <netinet6/udp6_var.h>
 100 #include <netinet6/pim6_var.h>
 101 #include <netinet6/nd6.h>
 102
 103 #include <netinet6/ip6protosw.h>
 104
 105 #include <net/net_osdep.h>
 106
 107 #ifdef CARP
 108 #include <netinet/ip_carp.h>
 109 #endif
 110
 111
 112 /*
 113  * TCP/IP protocol family: IP6, ICMP6, UDP, TCP.
 114  */
 115
 116 extern  struct domain inet6domain;
 117 static struct pr_usrreqs nousrreqs;
 118
 119 #define PR_LISTEN       0
 120 #define PR_ABRTACPTDIS  0
 121
 122 struct protosw inet6sw[] = {
 123     {
 124         .pr_type = 0,
 125         .pr_domain = &inet6domain,
 126         .pr_protocol = IPPROTO_IPV6,
 127         .pr_flags = 0,
 128
 129         .pr_init = ip6_init,
 130         .pr_drain = frag6_drain,
 131         .pr_usrreqs = &nousrreqs
 132     },
 133     {
 134         .pr_type = SOCK_DGRAM,
 135         .pr_domain = &inet6domain,
 136         .pr_protocol = IPPROTO_UDP,
 137         .pr_flags = PR_ATOMIC | PR_ADDR | PR_MPSAFE | PR_LASTHDR,
 138
 139         .pr_input = udp6_input,
 140         .pr_output = 0,
 141         .pr_ctlinput = udp6_ctlinput,
 142         .pr_ctloutput = ip6_ctloutput_dispatch,
 143
 144         .pr_ctlport = cpu0_ctlport,
 145         .pr_usrreqs = &udp6_usrreqs
 146     },
 147     {
 148         .pr_type = SOCK_STREAM,
 149         .pr_domain = &inet6domain,
 150         .pr_protocol = IPPROTO_TCP,
 151         .pr_flags = PR_CONNREQUIRED | PR_WANTRCVD | PR_LISTEN |
 152                     PR_MPSAFE | PR_LASTHDR | PR_ASYNC_SEND | PR_ASYNC_RCVD,
 153
 154         .pr_input = tcp6_input,
 155         .pr_output = NULL,
 156         .pr_ctlinput = tcp6_ctlinput,
 157         .pr_ctloutput = tcp_ctloutput,
 158
 159         .pr_ctlport = cpu0_ctlport,
 160 #ifndef INET
 161         /* don't call initialization and timeout routines twice */
 162         .pr_init = tcp_init,
 163 #endif
 164         .pr_drain = tcp_drain,
 165         .pr_usrreqs = &tcp6_usrreqs
 166     },
 167     {
 168         .pr_type = SOCK_RAW,
 169         .pr_domain = &inet6domain,
 170         .pr_protocol = IPPROTO_RAW,
 171         .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 172
 173         .pr_input = rip6_input,
 174         .pr_output = rip6_output,
 175         .pr_ctlinput = rip6_ctlinput,
 176         .pr_ctloutput = rip6_ctloutput,
 177
 178         .pr_ctlport = cpu0_ctlport,
 179         .pr_usrreqs = &rip6_usrreqs
 180     },
 181     {
 182         .pr_type = SOCK_RAW,
 183         .pr_domain = &inet6domain,
 184         .pr_protocol = IPPROTO_ICMPV6,
 185         .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 186
 187         .pr_input = icmp6_input,
 188         .pr_output = rip6_output,
 189         .pr_ctlinput = rip6_ctlinput,
 190         .pr_ctloutput = rip6_ctloutput,
 191
 192         .pr_ctlport = cpu0_ctlport,
 193         .pr_init = icmp6_init,
 194         .pr_drain = NULL,
 195
 196         .pr_usrreqs = &rip6_usrreqs
 197     },
 198     {
 199         .pr_type = SOCK_RAW,
 200         .pr_domain = &inet6domain,
 201         .pr_protocol = IPPROTO_DSTOPTS, PR_ATOMIC|PR_ADDR,
 202
 203         .pr_input = dest6_input,
 204         .pr_output = NULL,
 205         .pr_ctlinput = NULL,
 206         .pr_ctloutput = NULL,
 207
 208         .pr_usrreqs = &nousrreqs
 209     },
 210     {
 211         .pr_type = SOCK_RAW,
 212         .pr_domain = &inet6domain,
 213         .pr_protocol = IPPROTO_ROUTING, PR_ATOMIC|PR_ADDR,
 214
 215         .pr_input = route6_input,
 216         .pr_output = NULL,
 217         .pr_ctlinput = NULL,
 218         .pr_ctloutput = NULL,
 219
 220         .pr_usrreqs = &nousrreqs
 221     },
 222     {
 223         .pr_type = SOCK_RAW,
 224         .pr_domain = &inet6domain,
 225         .pr_protocol = IPPROTO_FRAGMENT, PR_ATOMIC|PR_ADDR,
 226
 227         .pr_input = frag6_input,
 228         .pr_output = NULL,
 229         .pr_ctlinput = NULL,
 230         .pr_ctloutput = NULL,
 231
 232         .pr_usrreqs = &nousrreqs
 233     },
 234 #ifdef INET
 235     {
 236         .pr_type = SOCK_RAW,
 237         .pr_domain = &inet6domain,
 238         .pr_protocol = IPPROTO_IPV4,
 239         .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 240
 241         .pr_input = encap6_input,
 242         .pr_output = rip6_output,
 243         .pr_ctlinput = NULL,
 244         .pr_ctloutput = rip6_ctloutput,
 245
 246         .pr_init = encap_init,
 247         .pr_usrreqs = &rip6_usrreqs
 248     },
 249 #endif /* INET */
 250     {
 251         .pr_type = SOCK_RAW,
 252         .pr_domain = &inet6domain,
 253         .pr_protocol = IPPROTO_IPV6,
 254         .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 255
 256         .pr_input = encap6_input,
 257         .pr_output = rip6_output,
 258         .pr_ctlinput = NULL,
 259         .pr_ctloutput = rip6_ctloutput,
 260
 261         .pr_init = encap_init,
 262         .pr_usrreqs = &rip6_usrreqs
 263     },
 264     {
 265         .pr_type = SOCK_RAW,
 266         .pr_domain = &inet6domain,
 267         .pr_protocol = IPPROTO_PIM,
 268         .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 269
 270         .pr_input = pim6_input,
 271         .pr_output = rip6_output,
 272         .pr_ctlinput = NULL,
 273         .pr_ctloutput = rip6_ctloutput,
 274
 275         .pr_usrreqs = &rip6_usrreqs
 276     },
 277 #ifdef CARP
 278     {
 279         .pr_type = SOCK_RAW,
 280         .pr_domain = &inet6domain,
 281         .pr_protocol = IPPROTO_CARP,
 282         .pr_flags = PR_ATOMIC|PR_ADDR,
 283
 284         .pr_input = carp6_proto_input,
 285         .pr_output = rip6_output,
 286         .pr_ctlinput = NULL,
 287         .pr_ctloutput = rip6_ctloutput,
 288
 289         .pr_usrreqs = &rip6_usrreqs
 290     },
 291 #endif /* CARP */
 292
 293     /* raw wildcard */
 294     {
 295         .pr_type = SOCK_RAW,
 296         .pr_domain = &inet6domain,
 297         .pr_protocol = 0,
 298         .pr_flags = PR_ATOMIC|PR_ADDR,
 299
 300         .pr_input = rip6_input,
 301         .pr_output = rip6_output,
 302         .pr_ctlinput = NULL,
 303         .pr_ctloutput = rip6_ctloutput,
 304
 305         .pr_usrreqs = &rip6_usrreqs
 306     },
 307 };
 308
 309 extern int in6_inithead (void **, int);
 310
 311 struct domain inet6domain = {
 312         .dom_family             = AF_INET6,
 313         .dom_name               = "internet6",
 314         .dom_init               = NULL,
 315         .dom_externalize        = NULL,
 316         .dom_dispose            = NULL,
 317         .dom_protosw            = inet6sw,
 318         .dom_protoswNPROTOSW    = &inet6sw[NELEM(inet6sw)],
 319         .dom_next               = SLIST_ENTRY_INITIALIZER,
 320         .dom_rtattach           = in6_inithead,
 321         .dom_rtoffset           = offsetof(struct sockaddr_in6, sin6_addr) << 3,
 322         .dom_maxrtkey           = sizeof(struct sockaddr_in6),
 323         .dom_ifattach           = in6_domifattach,
 324         .dom_ifdetach           = in6_domifdetach
 325 };
 326
 327 DOMAIN_SET(inet6);
 328
 329 /*
 330  * Internet configuration info
 331  */
 332 #ifndef IPV6FORWARDING
 333 #ifdef GATEWAY6
 334 #define IPV6FORWARDING  1       /* forward IP6 packets not for us */
 335 #else
 336 #define IPV6FORWARDING  0       /* don't forward IP6 packets not for us */
 337 #endif /* GATEWAY6 */
 338 #endif /* !IPV6FORWARDING */
 339
 340 #ifndef IPV6_SENDREDIRECTS
 341 #define IPV6_SENDREDIRECTS      1
 342 #endif
 343
 344 int     nd6_onlink_ns_rfc4861 = 0; /* allow 'on-link' NS/NA (as in RFC 4861) */
 345
 346 int     ip6_forwarding = IPV6FORWARDING;        /* act as router? */
 347 int     ip6_sendredirects = IPV6_SENDREDIRECTS;
 348 int     ip6_defhlim = IPV6_DEFHLIM;
 349 int     ip6_minhlim = IPV6_MINHLIM;
 350 int     ip6_defmcasthlim = IPV6_DEFAULT_MULTICAST_HOPS;
 351 int     ip6_accept_rtadv = 0;   /* "IPV6FORWARDING ? 0 : 1" is dangerous */
 352 int     ip6_maxfragpackets;     /* initialized in frag6.c:frag6_init() */
 353 int     ip6_maxfrags;           /* initialized in frag6.c:frag6_init() */
 354 int     ip6_log_interval = 5;
 355 int     ip6_hdrnestlimit = 50;  /* appropriate? */
 356 int     ip6_dad_count = 1;      /* DupAddrDetectionTransmits */
 357 u_int32_t ip6_flow_seq;
 358 int     ip6_auto_flowlabel = 1;
 359 int     ip6_gif_hlim = 0;
 360 int     ip6_use_deprecated = 1; /* allow deprecated addr (RFC2462 5.5.4) */
 361 int     ip6_rr_prune = 5;       /* router renumbering prefix
 362                                  * walk list every 5 sec. */
 363
 364 u_int32_t ip6_id = 0UL;
 365 time_t  ip6_log_time = (time_t)0L;
 366
 367 /* icmp6 */
 368 /*
 369  * BSDI4 defines these variables in in_proto.c...
 370  * XXX: what if we don't define INET? Should we define pmtu6_expire
 371  * or so? (jinmei@kame.net 19990310)
 372  */
 373 int pmtu_expire = 60*10;
 374 int pmtu_probe = 60*2;
 375
 376 /* raw IP6 parameters */
 377 /*
 378  * Nominal space allocated to a raw ip socket.
 379  */
 380 #define RIPV6SNDQ       8192
 381 #define RIPV6RCVQ       8192
 382
 383 u_long  rip6_sendspace = RIPV6SNDQ;
 384 u_long  rip6_recvspace = RIPV6RCVQ;
 385
 386 /* ICMPV6 parameters */
 387 int     icmp6_rediraccept = 1;          /* accept and process redirects */
 388 int     icmp6_redirtimeout = 10 * 60;   /* 10 minutes */
 389 int     icmp6errppslim = 100;           /* 100pps */
 390 int     icmp6_nodeinfo = 3;             /* enable/disable NI response */
 391
 392 /* UDP on IP6 parameters */
 393 int     udp6_sendspace = 9216;          /* really max datagram size */
 394 int     udp6_recvspace = 40 * (1024 + sizeof(struct sockaddr_in6));
 395                                         /* 40 1K datagrams */
 396
 397 /*
 398  * sysctl related items.
 399  */
 400 SYSCTL_NODE(_net,       PF_INET6,       inet6,  CTLFLAG_RW,     0,
 401         "Internet6 Family");
 402
 403 /* net.inet6 */
 404 SYSCTL_NODE(_net_inet6, IPPROTO_IPV6,   ip6,    CTLFLAG_RW, 0,  "IP6");
 405 SYSCTL_NODE(_net_inet6, IPPROTO_ICMPV6, icmp6,  CTLFLAG_RW, 0,  "ICMP6");
 406 SYSCTL_NODE(_net_inet6, IPPROTO_UDP,    udp6,   CTLFLAG_RW, 0,  "UDP6");
 407 SYSCTL_NODE(_net_inet6, IPPROTO_TCP,    tcp6,   CTLFLAG_RW, 0,  "TCP6");
 408
 409 /* net.inet6.ip6 */
 410 static int
 411 sysctl_ip6_temppltime(SYSCTL_HANDLER_ARGS)
 412 {
 413         int error = 0;
 414         int old;
 415
 416         error = SYSCTL_OUT(req, arg1, sizeof(int));
 417         if (error || !req->newptr)
 418                 return (error);
 419         old = ip6_temp_preferred_lifetime;
 420         error = SYSCTL_IN(req, arg1, sizeof(int));
 421         if (ip6_temp_preferred_lifetime <
 422             ip6_desync_factor + ip6_temp_regen_advance) {
 423                 ip6_temp_preferred_lifetime = old;
 424                 return (EINVAL);
 425         }
 426         return (error);
 427 }
 428
 429 static int
 430 sysctl_ip6_tempvltime(SYSCTL_HANDLER_ARGS)
 431 {
 432         int error = 0;
 433         int old;
 434
 435         error = SYSCTL_OUT(req, arg1, sizeof(int));
 436         if (error || !req->newptr)
 437                 return (error);
 438         old = ip6_temp_valid_lifetime;
 439         error = SYSCTL_IN(req, arg1, sizeof(int));
 440         if (ip6_temp_valid_lifetime < ip6_temp_preferred_lifetime) {
 441                 ip6_temp_preferred_lifetime = old;
 442                 return (EINVAL);
 443         }
 444         return (error);
 445 }
 446
 447 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_FORWARDING, forwarding, CTLFLAG_RW,
 448     &ip6_forwarding, 0, "Enable IP forwarding between interfaces");
 449 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_SENDREDIRECTS, redirect, CTLFLAG_RW,
 450     &ip6_sendredirects, 0, "Enable sending IP redirects");
 451 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DEFHLIM,
 452     hlim, CTLFLAG_RW, &ip6_defhlim, 0, "Default hop limit");
 453 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_MINHLIM,
 454     minhlim, CTLFLAG_RW, &ip6_minhlim, 0, "Default hop limit");
 455 SYSCTL_STRUCT(_net_inet6_ip6, IPV6CTL_STATS, stats, CTLFLAG_RD,
 456     &ip6stat, ip6stat, "IP stats");
 457 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_MAXFRAGPACKETS, maxfragpackets,
 458     CTLFLAG_RW, &ip6_maxfragpackets, 0, "Maximum packets in reassembly queue");
 459 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_ACCEPT_RTADV, accept_rtadv,
 460     CTLFLAG_RW, &ip6_accept_rtadv, 0, "Acts as a host not a router");
 461 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_LOG_INTERVAL,
 462         log_interval, CTLFLAG_RW,       &ip6_log_interval,      0, "");
 463 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_HDRNESTLIMIT, hdrnestlimit, CTLFLAG_RW,
 464     &ip6_hdrnestlimit,  0, "Upper limit of # of extension headers");
 465 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DAD_COUNT, dad_count, CTLFLAG_RW,
 466     &ip6_dad_count, 0, "Number of times to perform duplicate address detectione");
 467 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_AUTO_FLOWLABEL, auto_flowlabel, CTLFLAG_RW,
 468     &ip6_auto_flowlabel, 0, "Enable attaching flowlabel automatically");
 469 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DEFMCASTHLIM, defmcasthlim, CTLFLAG_RW,
 470     &ip6_defmcasthlim, 0, "Default multicast hop limit");
 471 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_GIF_HLIM, gifhlim, CTLFLAG_RW,
 472     &ip6_gif_hlim,      0, "Hop limit for gif encap packet");
 473 SYSCTL_STRING(_net_inet6_ip6, IPV6CTL_KAME_VERSION,
 474         kame_version, CTLFLAG_RD,       __KAME_VERSION,         0, "Kame version");
 475 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USE_DEPRECATED, use_deprecated, CTLFLAG_RW,
 476     &ip6_use_deprecated, 0, "Allow deprecated addr as source");
 477 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_RR_PRUNE,
 478         rr_prune, CTLFLAG_RW,   &ip6_rr_prune,  0,
 479     "Walk timer for router renumbering");
 480 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USETEMPADDR, use_tempaddr, CTLFLAG_RW,
 481     &ip6_use_tempaddr, 0, "Whether to use temporary addresses");
 482 SYSCTL_OID(_net_inet6_ip6, IPV6CTL_TEMPPLTIME, temppltime,
 483     CTLTYPE_INT|CTLFLAG_RW, &ip6_temp_preferred_lifetime, 0,
 484     sysctl_ip6_temppltime, "I",
 485     "Preferred lifetime for tmpaddrs");
 486 SYSCTL_OID(_net_inet6_ip6, IPV6CTL_TEMPVLTIME, tempvltime,
 487     CTLTYPE_INT|CTLFLAG_RW, &ip6_temp_valid_lifetime, 0,
 488     sysctl_ip6_tempvltime, "I",
 489     "Valid lifetime for tmpaddrs");
 490 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_AUTO_LINKLOCAL, auto_linklocal, CTLFLAG_RW,
 491     &ip6_auto_linklocal, 0, "Enable auto-assigning a link-local address");
 492 SYSCTL_STRUCT(_net_inet6_ip6, IPV6CTL_RIP6STATS, rip6stats, CTLFLAG_RD,
 493     &rip6stat, rip6stat, "Raw stats");
 494 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_MAXFRAGS, maxfrags, CTLFLAG_RW,
 495     &ip6_maxfrags, 0, "Maximum fragments in reassembly queues");
 496
 497 /* net.inet6.icmp6 */
 498 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_REDIRACCEPT, rediraccept, CTLFLAG_RW,
 499     &icmp6_rediraccept, 0, "If enabled, accept and process redirects");
 500 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_REDIRTIMEOUT, redirtimeout, CTLFLAG_RW,
 501     &icmp6_redirtimeout, 0, "Cache time for redirect routes");
 502 SYSCTL_STRUCT(_net_inet6_icmp6, ICMPV6CTL_STATS, stats, CTLFLAG_RD,
 503     &icmp6stat, icmp6stat, "Stats");
 504 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_PRUNE, nd6_prune, CTLFLAG_RW,
 505     &nd6_prune, 0, "Prune interval");
 506 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_DELAY, nd6_delay, CTLFLAG_RW,
 507     &nd6_delay, 0, "Reachability timeout for stale neighbors");
 508 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_UMAXTRIES, nd6_umaxtries, CTLFLAG_RW,
 509     &nd6_umaxtries,     0, "Maximum unicast query");
 510 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_MMAXTRIES, nd6_mmaxtries, CTLFLAG_RW,
 511     &nd6_mmaxtries, 0, "Maximum multicast query");
 512 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_USELOOPBACK, nd6_useloopback, CTLFLAG_RW,
 513     &nd6_useloopback, 0, "Use loopback interface for local traffic");
 514 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_NODEINFO,
 515     nodeinfo, CTLFLAG_RW, &icmp6_nodeinfo, 0, "Enable/disable NI response");
 516 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ERRPPSLIMIT,
 517         errppslimit, CTLFLAG_RW,        &icmp6errppslim,        0,
 518     "ICMPv6 error maximum packet-per-second value (default: 100pps)");
 519 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_MAXNUDHINT, nd6_maxnudhint, CTLFLAG_RW,
 520     &nd6_maxnudhint, 0, "Max # of subsequent upper layer hints");
 521 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_DEBUG, nd6_debug, CTLFLAG_RW,
 522     &nd6_debug, 0, "Enable debug output");
 523 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_ONLINKNSRFC4861, nd6_onlink_ns_rfc4861, CTLFLAG_RW,
 524     &nd6_onlink_ns_rfc4861, 0, "Accept 'on-link' NS/NA in compliance with RFC 4861.");